Meta M1 Core - Black Rubber - MW4003 Smart Watch - Bluetooth 4.0 connectivity iOS and Android Compatible - Stainless Steel Face - Black Nylon and Black Rubber Strap Weight: 303 grams Active Screen Size: 23.44 mm x 23.44 mm Display:128 x 128 Memory pixel LCD Battery Life: 5-7 days Wireless Technology: Bluetooth 4.0